Process timer (CB21865E)

We found this timer for times of a few minutes in a 1974 Ferranti transistor manual. The relay is 37 mA sensitive type.

Moisture Detector (CB22049E)
We found this sensitive moisture detector in an old documentation. The circuit uses a common JFET,...
Infrared Remote-Control Test (CB18824E)
This circuit, with the assembly in a contact matrix, was found in a publication from the 90s. The...
Darlington Modulator (CB14800E)
This modulator circuit for transmitters was found in American documentation from 1964. It can be...